K/T have no meaning at all because they punish the people doing something as realistic as long fighter sweeps, friendly CAP, buff interception towards HQ, scorting buffs, etc.
In the other hand, Hit% is too dependant on the guns u use and the target u fire at. Do you want a boost in your hit%, find a goon and discard all your bullets in it.
IMO, K/T and Hit% should be deleted but considered for points when your flight ends, as well as other factors as fuel loaded or time of the day. Taking off with 100% fuel at night and getting a kill should rewards more points and taking off with 25% at morning time and getting the same kill.